Desperate need help baby wont sleep Urgent! Help.

I am in desperate need of help. My 7 week old dd won't sleep today! I can rock her to sleep but she wont stay asleep. I have now put her down 4 times but she keeps waking up. I think she is now so over teird and I am exhausted what do I do?! I have tried feedi g her this doesn't seem to help. She is just fussing at the breat pushing me away then throwing up everything. I actually am lost and so in need of help! Urgently what do I do?

Have a read of this: https://www.babydoc.com.au/faq/colic...baby-to-sleep/ overtiredness can make it harder to settle them to sleep.
Try dark room laying down no stimulation. Stroke bubs forehead gently downwards in between or over her eyes - encourages them to close eyes and can be enough to help some drift off.
Try pram on a bumpy walk or in the house bumping the pram over the edge of a rug or something the jiggling helps them drift off. Car ride. Baby carrier.
Baby will eventually go to sleep. Try not to stress too much I know it sounds awful but they can pick up on stress which can make it harder.
If the rocking is helping her fall asleep and she's waking up when you put her down then don't put her down - let her sleep on you if that's where she needs to be today.

I just feel aweful. As I just like I cant do it today. I cant sit still with her for two hours. I feel so close to tears, I think I have restless legs and back is in so much pain... i have just hit a wall and feel absolutely lost and helpless. I am sick of sitting.. i feel like thats all I do is sit and feed her..

Oh yes I remember those days well. It's so hard when you think your baby is never going to sleep!
Just try to surrender to a day on the couch with Bub on your chest watching TV, or lay down with baby if you think you might fall asleep (google safe co-sleeping guidelines).
If you think you will go crazy staying inside pop baby in a carrier (or pram) and go for a walk in the fresh air.
I found when mine got really agitated and just wouldn't calm down a bath helped settle them (even breastfeeding in the bath if necessary).
Hand baby to your partner when they get home and go have a long shower.
I promise you this will pass.

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